How to use the angularx-social-login.GoogleLoginProvider function in angularx-social-login

import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';

import { AppComponent } from './app.component';
import { NavbarComponent } from './navbar/navbar.component';
import { DemoComponent } from './demo/demo.component';

import { SocialLoginModule } from 'angularx-social-login';
import { AuthServiceConfig, GoogleLoginProvider, FacebookLoginProvider, LinkedInLoginProvider  } from 'angularx-social-login';


const config = new AuthServiceConfig([
  {
    id: GoogleLoginProvider.PROVIDER_ID,
    provider: new GoogleLoginProvider('624796833023-clhjgupm0pu6vgga7k5i5bsfp6qp6egh.apps.googleusercontent.com')
  },
  {
    id: FacebookLoginProvider.PROVIDER_ID,
    provider: new FacebookLoginProvider('561602290896109')
  },
  {
    id: LinkedInLoginProvider.PROVIDER_ID,
    provider: new LinkedInLoginProvider('78iqy5cu2e1fgr')
  }
]);

export function provideConfig() {
  return config;
}

@NgModule({

configService.getConfig().subscribe((config) => {
    if (config != null) {
      if (configService.getGoogleClientId() != null) {
        autServiceConfig.providers.set(GoogleLoginProvider.PROVIDER_ID,
          new GoogleLoginProvider(configService.getGoogleClientId(), googleLoginOptions));
      }
    }
  });
  return autServiceConfig;